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3"high flow cat cuestion...

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Old Jan 26, 2026 | 04:32 PM
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3"high flow cat cuestion...

Hello after years without posting. lol
I still have my 03, (31k miles) and I need a 3" catalytic converter.
(Emission test)
Which 3" high flow cat will pass emissions?
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Old Jan 26, 2026 | 07:22 PM
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Maybe the GESI cats? They’re supposed to emissions legal except for CA
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Old Jan 27, 2026 | 09:23 PM
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all of them if you have a tune. except visual inspection tho. i made a 100 cell cat with my bad welding skills and so far no issues
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Old Jan 28, 2026 | 08:20 AM
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I take it you are no longer in FL? I think the STM Gesi cats are listed as 48state (Like CA and Maine or something)

Edited: Yes, Here: https://stmtuned.com/products/stm-ev...-high-flow-cat

Last edited by RobbieOh; Jan 28, 2026 at 08:25 AM.
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Old Jan 28, 2026 | 08:26 AM
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From: Orlando/Ponce
Originally Posted by RobbieOh
I take it you are no longer in FL? I think the STM Gesi cats are listed as 48state (Like CA and Maine or something)

Edited: Yes, Here: https://stmtuned.com/products/stm-ev...-high-flow-cat
Well I still live in Fl, but I'm moving and shipping the car to PR to take care of my mother, she's 87 already.
I've been out of the Evo scene for so long that I forget names and brands all the time lol
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Old Jan 28, 2026 | 08:27 AM
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PR has emissions?? Dang! The Gesi is listed as EPA compliant, will that work for PR idk..

I also have been trying to convince my wife to move to PR lol
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Old Jan 28, 2026 | 08:31 AM
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From: Orlando/Ponce
Originally Posted by RobbieOh
PR has emissions?? Dang! The Gesi is listed as EPA compliant, will that work for PR idk..

I also have been trying to convince my wife to move to PR lol
Yep, annual emissions test as I understand, for cars 2 years or older, to get the registration sticker.
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Old Jan 28, 2026 | 08:36 AM
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From: Orlando/Ponce
Originally Posted by RobbieOh
PR has emissions?? Dang! The Gesi is listed as EPA compliant, will that work for PR idk..

I also have been trying to convince my wife to move to PR lol

I really don't want to move, but I can't leave my mother by herself at that age.
I've been trying to convince her (since 2005), to move with me to Florida.. but that's mission impossible. 😂
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Old Jan 30, 2026 | 09:44 AM
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I second VSLD, I have Milspec 100 cell 3" cat with no codes / CEL but I do not have emissions testing here. Tune matters also.
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Old Jan 30, 2026 | 10:24 AM
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From: NSB, FL
Originally Posted by AWDTurbo4
I really don't want to move, but I can't leave my mother by herself at that age.
I've been trying to convince her (since 2005), to move with me to Florida.. but that's mission impossible. 😂
Ah I get that, well good on you for being a good son. I just noticed we are neighbors too! Hopefully everything works out for you and your fam.
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